オーステナイト系 Fe-Co-Cr-Ni 基耐熱合金の時効硬化性と析出過程との関連性 : オーステナイト系耐熱合金の焼戻過程に関する研究 VII

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The present investigation aims at establishing the correlation between the age-hardening behaviour and the process of precipitation in austenitic age-hardenable Fe-Co-Cr-Ni base alloys, in order to obtain a useful information on the precipitation strengthening. In several stages of aging, measurements of mechanical properties and X-ray analysis of precipitates were made and microstructures were observed by means of the optical and electron microscopes. The results may be summarized as follows : The age-hardenability and the behaviour and dispersion characteristic of precipitates are markedly affected by the minor additional elements such as Mo, W, Cb and N. The precipitates detected by X-ray analysis are CbC or Cb (C, N), M_<23>C_6, M_6C, π and Laves phases, among which M_<23>C_6 and π phase play the main role in the age-hardening. There are two types of hardening, that is, one-stepped and two-stepped hardening. The former is observed in alloys with only one phase of either M_<23>C_6 or π as precipitate, the degree of hardening being principally affected by the volume fraction of the precipitates rather than the properties of precipitates. On the other hand, the two-stepped hardening is remarkable in alloys containing simultaneously Mo, W and N, and it is related with the transition of precipitates from M_<23>C_6 to π. The mechanical properties of these alloys are superior to those of single phase precipitation hardening alloys. Such high precipitation strengthening seems to be induced by favorably combined dispersion of M_<23>C_6 and π phases.
社団法人日本鉄鋼協会の論文
1963-08-01

著者

増本健
東北大学金属材料研究所

オーステナイト系 Fe-Co-Cr-Ni 基耐熱合金の時効硬化性と析出過程との関連性 : オーステナイト系耐熱合金の焼戻過程に関する研究 VII

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